Evan White already looks to be a good defensive first baseman however can he hit in the major leagues? I am sure we will find out in the next couple of years. If White does turn out to be the real thing the Mariners will move Ryon Healy to designated hitter on a regular basis with an occasional start at first unless Dipoto decides to trade him.
Another option would be to have him play at third base as well. This would depend whether Kyle Seager continues to digress or not.